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A, B and C can finish a piece of work in...

A, B and C can finish a piece of work in 12 days, 15 days and 20 days respectively. They started working together. B left the work after working 3 days and C left the work 3 days before completion of the work. In how many days work will be finished?

A

16 days

B

8 days

C

4 days

D

2 days

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